Davis J A, Lamberson W R
University of Missouri, Columbia 65211.
J Anim Sci. 1991 Feb;69(2):543-50. doi: 10.2527/1991.692543x.
Performance of six genetic groups of mice was studied in three different environments in order to determine the effect of heterosis on consistency of performance in varied environments. Designed as a 3 x 6 factorial, data were analyzed using least squares analyses of variance. Genetic group effects, environmental effects, genetic group x environment interaction, and heterosis were examined for 42-d weight, age and weight at vaginal opening, age and weight at puberty, ovulation rate (determined by total corpora lutea), number of implantations, and number of fetuses at 10 d of gestation. Weight at vaginal opening, ovulation rate, implantation rate and total number of fetuses exhibited significant heterosis. Regression of these traits against an environmental index (mean performance of all genetic groups over environments) provided an estimate of stability of performance. In general, genetic groups exhibiting heterosis expressed more consistent performance across environments than pure lines did. We conclude that a stability model could be used to aid in identification of lines with consistent performance for production traits in variable environments.
为了确定杂种优势对不同环境下性能一致性的影响，研究了六个遗传组的小鼠在三种不同环境中的表现。设计为3×6析因试验，使用最小二乘方差分析对数据进行分析。研究了遗传组效应、环境效应、遗传组×环境交互作用以及杂种优势对42日龄体重、阴道开口时的年龄和体重、青春期时的年龄和体重、排卵率（通过黄体总数确定）、着床数以及妊娠10天时的胎儿数的影响。阴道开口时的体重、排卵率、着床率和胎儿总数表现出显著的杂种优势。这些性状与环境指数（所有遗传组在不同环境下的平均表现）的回归分析提供了性能稳定性的估计。一般来说，表现出杂种优势的遗传组在不同环境下的表现比纯系更一致。我们得出结论，稳定性模型可用于帮助识别在可变环境中生产性状表现一致的品系。
